GREY'S ANATOMY - "This Is How We Do It" - Richard is desperate for Derek and Meredith to accept Adele into their Alzheimer's trial, but will Adele stand in her own way? Meanwhile Mark and Arizona have conflicting ideas of the kind of baby shower Callie wants, Teddy is freaked out when Henry has another health complication -- leaving them both a little exposed -- and the competitiveness amongst the residents for the Chief Resident position is amplified when Richard receives the green light for his diabetes clinical trial, on "Grey's Anatomy," THURSDAY, MARCH 24 (9:00-10:01 p.m., ET) on the ABC Television Network.